DOH! It's not a 611, for sure. It matches the 771 in the 1926 parts book (page 164 of the Repairer's Ref), but it didn't look 13 lignes to me until I measured it a few times. Weird movement to be in there. There's enough room in the case with no problem, not an overly tight fit as if it were replacing a 707. Sloppy research on my part. Thanks for the correction! Any idea of what it could be?